Solving: Node_ENV is not internal or external command, nor is it runable, or batch files

1 environment

win10+powershell

2 problem

The NPM Script I want to perform is as follows:
(The content of the script does not need attention, you need to pay attention to it.)

"scripts": {
        "build": "NODE_ENV=production webpack",
        "dev": "NODE_ENV=development node dev-server.js"
 }

Two scripts have reported the same error:

Node_env is not internal or external command, nor is it a running program, or a batch file

In fact, both of the above two scripts are merged (this operation is not supported in PowerShell, nor support in CMD, this is a unique operation in the Mac in Bash or Linux's shell), split two The script is as follows:

  "scripts": {
        "build": "set NODE_ENV=production && webpack",
        "dev": "set NODE_ENV=development && node dev-server.js"
    },

Run the script, no error

the above.

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